Die holder



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Patented June 21, 1932 UNITED STATES PATENT oFFlce ALBERL` RAFTER, OF BELLEVILLE, NEW JERSEY, ASSIGNOR TO RAFTER MACHINE COM- PANY, OF BELLEVILLE, NEW JERSEY, 'A PARTNERSHIP COMPOSED 0F ALBERT RAFTER AND JOHN o. RAFTER, JR.

DIE HOLDER This invention relates to machines for stamping sheet metal in desired shapes, and more particularly to a clamping die holder of novel and simple construction so arranged that the die may be readily inserted and removed. ,f

As described in Patent No. 1,778,339, granted to me October `14, 1930, machines for. stamping sheet metal are usually very heavy, often weighing in the neighborhood of 35,000 pounds and exerting pressures up to 200,000 pounds. v

The stamping operation is accomplished by bringing a male die member `or punch lnto engagement, under high pressure, with the metal plate positioned on the female die member.

Frequently, the machine is not properly requiring one or two'days, which obviously resulted in the stamping machine remaining idle for that time.

It is an object of this invention to provide a die holder for stamping machines, which die holder is formed from a plurality of .relatively adjustable parts which enable the easy release of the male and female dies when they bind.

A further object is the provision of a readily rel-easable die holder which may be applied to standard stamping machines without material alteration.

These and other objects are attained by the novel construction, combination and arrangement of `parts hereinafter described and shown in the accompanying drawing, constituting a material part of this disclosure and in which:

Figure 1 represents a cross sectional view of the die holder when in clamped position, taken on line 11M-A of Figure 3.

Figure 2 represents a cross sectional view 1931. serial No. 547,826.

of the die holder, taken on lineB-B of Figure; 3, and Y Figure 3 represents a side elevation of the die holderas' mounted onv the bed of a stampingV machine. Referring to the drawing, the initspreferie'd form consists of a longitudinal support 10 Vadapted to be secured to the bed'll' of the stamping machine in anyl desiredor convenient mannen preferably by 50,

means of an integral tenon'12 extending longitudinally of the bottomV thereof which lits into the groove 13 but is preferably of a1 height slightly less than the depth ofthe groove, or the die holder can be secured Vto .65 the hammer of the machine (not shown) if so desired;V

The support 10 is Aprovided with surfaces 14e lwhich are inclined inwardly and upward ly, said surfacesconnecting with 'the' up- 117,)

wardly extending centralA portion 15 and eX- tending longitudinally of the support 10.

Located near the top of the central porjtion 15 are diametrically opposed grooves 16-16 also extending longitudinally of the f support 10. l

Secured to and carried by said support 10 are clamping plates 17-17, the upperv portion of 'each plate being provided with a jaw 18 and the lower portion of each plate witlrso an inclined surface 19, these vinclined surl' faces 19 coinciding with the inclined `surfaces lltof the support 10 so that the clamping plates have sliding contact with the support.

Theinner surfaceV of each clamping plate-S5 17 is, further provided with a longitudinally arranged vgib v2o which has slidin'gengagement with the groove 16 of the central por* tion 15 ofthe support 10 and which also serves to limit the movement of the clamp-90 ing plate 17. Y Y Y l The die member 20 shown in dotted linesis clamped between the jaws 18 of the `clam'pfv ingplates 17 by means Vof the bolts 21 having'threaded thereon the nuts 22. f A plurality of spiral springs 2 3 are located in suitable recesses 2li in thelclamping plates and pass through suitable apertures 25 in central portion 15 ofthe support 10 which exert their pressure for normally sepa-,loo

die holder m Y cq; adjustably connecting saidclamping plates rating the clamping plates when the nuts22 v are loosened from the bolts 21.

In operation when the die members bind, the nuts 22 are loosened on bolts 21, thus allowing the clamping plates 17-f17V to separate under the pressure applied by the springs 23 permitting the plates to move down on theV inclined surfaces 14 of tliesupport `1() and also permitting the bolts 21 to drop in the elongated apertures 27 in the central portion 15. Usually it is only necessary to move the clamping plates outwardly a few thou-Y" sands of an inch to release the bound dies. i Y

F rom the above description, it will be readily seen that l have provided a clamping die holder which will 'enable the easy release of bound dies land permit the normal operation of astamping machine in a short time. The die holder is so constructedthat it may Y be applied to the bed of any standard stamping machine Without material alteration.

The foregoing disclosure isto be regarded as descriptive and illustrative `o'nly,. and not as restrictive or limitative of thelinventioii,

of which obviously an embodiment maybe constructed including. many `inodifications without departing fromk the.y general scope A herein indicated and denoted intheappended Patent, is:V .v i .i .Y 1. AY die holder for a stamping machine,

claims.

I claim as new and desire to secure yby Letters means passing through the said apertured support and aperturedclamping plates for adjustably connecting the saine.

5- A die holder for estampilla mhllff comprising aV supportprovided with acentral portion extending longitudinally thereof E.

and having oppositely arranged grooves, re-

cessed clamping plates carried by said support provided with means engaging said `grooves andha'v'i'ng sliding engagement therewith to limitv the'movement of the clamping plates on said support, resilient means pass ing through said lcent-ral portion andlocated Y inthe recesses of'said clamping Iplates lfor normally separatingthe clamping plates, and

means for adjustably'connecting said claiiiping plates and said support. y i

`This specification signed this 18th day `of June, 1931.V Y Y Y ALBERT RAFTER. i

Having thus described my inventiomwhat comprising a supportprovided'with a central l' portion and inclined surfaces vconnecting the.

Y central portion with saidsupport and extend- I ing longitudinally thereof, clamping platesv carried by said support provided with. in- Y clined surfaces coinciding: withV theinclined i j surfaces of thesupport and means for adjustably connecting Vsaid clamping `platesand .Y

support.

Y,central portion wit-h said support and ex- 2. A die holdervfor a stamping machine, i

tending longitudinally thereof, spring actu- Y .e ated clamping plates carried bysaid support provided with inclined surfaces coinciding Vwith the inclined surfaces of the (support, and means for adjustably connecting said clamping plates and support.

8. die holder for a stamping comprisingk an apertured support provided machine,

with inclined surfaces extending longitudii n ally thereof, clamping plates .having correspondingly inclined surfaces having sliding i engagement with saidsupport, andmeans passing through said apertured support for Y Y and said support.. Y

4. die holder for a stamping-machine,

` 4comprising a support provided with an aper- `tured central portion andinclined surfaces 

